class TreeNode {
    int val;
    TreeNode left;
    TreeNode right;
    TreeNode() {}
    TreeNode(int val) { this.val = val; }
    TreeNode(int val, TreeNode left, TreeNode right) {
        this.val = val;
        this.left = left;
        this.right = right;
     }
  }


class Solution {
    public boolean isSameTree(TreeNode p, TreeNode q) {
        if (p!=null&&q==null||p==null&&q!=null){
            return false;
        }
        if (p==null&&q==null){
            return true;
        }
        if (p.val != q.val){
            return false;
        }
        return isSameTree(p.left,q.left)&&isSameTree(p.right,q.right);
    }
}

public class Text5 {
}
